I just finished my Freewing F18. I have only taxied it on our club paved runway. No maiden yet. When I first advance the throttle there is a high pitched squeal which disappears as the throttle is increased. Its awesome 12 blade whoosh continues until I again decrease the throttle. Is this a normal sound for the fan at low RPM? Anybody else have one of these fans?
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Yes, this is normal for the fan system.
Even with 12 blades, the fan has to pick up the air volume and get it moving. The high-pitch squeal you hear at low throttle is the impeller rpm pulling low volume of air flow through the fan. That squeal will give way to the more pleasing woosh sound as the throttle increases and the air flow volume increases through the fan and model. Each airframe will have a pronounced and distinct affect on that sound as well. My FW F-16 Falcon carries more of the high pitch whine at full throttle than my FW F-15 Eagle.
I do have another question for you that is off topic here but does relate to the FW F-18 though. Did you have any trouble setting up the Thrust Vectoring on your Hornet?? I had a bitch of a time getting the servos to maintain center and equal travel distance. I noticed that the servos used on all the T.V. were all reverse type servos and in the end, I replaced the 2 that were tied to the elevator / aileron mixes with FW standard servos and the programing started to behave properly. { still a bitch to dial in though. :s } -
Thanks much for your explanation, Arcangel. Yes. Fortunately for me another member of my club who has flown an older version of the F18 maidened it for me. He had a heck of a time trimming it out and had me tweak the vectors twice and they still were not right but we ran out of time and light. Will try again.Comment
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Update on my F18: I actually flew it today myself for the first time with a 6000ma battery. Wind down the runway (concrete) and estimated 8-10. It wasn't as difficult to fly as I was anticipating after watching it maidened. Brad must have gotten some of the bugs out. Actually, one of the biggest bugs was the ailerons were reversed! A case I think, of too many cooks spoil the broth. Brad turned on the transmitter and I plugged in the battery. Neither of us pre-flighted the plane. Brad was able to miraculously keep it in the air long enough for a guest at the field to run out and reverse the channel while Brad flew. Together, they saved my aircraft. Thanks Brad and Robert. I need to get some more airtime with it but so far I think its a winner. Robert flies a museum scale, twin turbine A10. Beautiful!!!Comment
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